PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-17:12:40
G08     311.1          18.1                6.6 +/-    1.42      15.3 +/-    1.42  0.050 / 0.070
G10     327.9          59.2                6.3 +/-    1.39       7.2 +/-    1.39  0.050 / 0.080
G14     217.5          29.5               10.1 +/-    1.17      17.8 +/-    1.17  0.030 / 0.050
G15     46.6           10.7                7.0 +/-    1.63      19.1 +/-    1.63  0.030 / 0.050
G18     39.3           58.9                6.6 +/-    0.46       7.6 +/-    0.46  0.120 / 0.140
G21     132.8          53.0                9.7 +/-    0.82      11.8 +/-    0.82  0.220 / 0.250
G24     77.0           30.5                7.8 +/-    0.90      13.5 +/-    0.90  0.100 / 0.210
G27     275.2          37.8                7.8 +/-    0.99      11.9 +/-    0.99  0.090 / 0.180
G32     222.2          50.0                8.7 +/-    2.40      10.9 +/-    2.40  0.040 / 0.050